Impurity Conduction in Cadmium Sulfide at Low Temperatures

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Abstract
Impurity conduction has been investigated in three types of cadmium sulfide crystals, that is, Cl-doped cadmium sulfide, undoped cadmium sulfide grown from the vapour phase, and undoped cadmium sulfide grown by the melt. The crystals of Cl-doped cadmium sulfide exhibit the characteristics of impurity conduction at low temperatures which are similar to those of n -type germanium and n -type silicon: A metallic impurity conduction occurs above the excess donor concentration of 2×10 18 cm -3 . The concentration range between 4×10 16 cm -3 and 2×10 18 cm -3 is intermediate between metallic type and non-metallic one. A negative magnetoresistance effect is observed at the excess donor concentrations above 2×10 18 cm -3 in the temperature range from 1.5°K to 4.2°K.

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